If I can see the end of a roll of carpet I can figure out the
approximate square yardage by taking the inside circumference, the
outside circumference and the number of total layers left, then
calculating each layer. Is there a formula I can apply to calculate
the result directly?

Ravina wants to cut a square cake using straight vertical cuts to make
five pieces of equal volume. If she makes the first cut from the cake's
center to the top left corner, where must she make the other cuts if they
all start from the cake's center?

On a perfectly circular, small, flat island, a glass dome covers the
island, forming a perfect hemisphere. If the canopy is 10 feet tall at
the center of the island, how far from the center can 6-foot-tall Omar
walk upright?

A pool's surface forms a rectangle 25 meters long by 15 meters wide. The
pool is 2 meters deep at the shallow end and the depth increases at the
constant rate to four meters at the other end. How many liters of water
will the pool hold?

A reel of flat blade has an outer diameter of 1016 mm and an inner
diameter of 508 mm. The blade thickness is 20 mm. Could you tell me
the length of the blade and show me the formula for working it out?